[go: up one dir, main page]

WO2007085948A2 - Mécanisme de création d'un fonctionnement automatique en mode d'économie d'énergie (famee) compatible avec l'agrégation de trames et la confirmation de blocs dans un scénario 802.11n - Google Patents

Mécanisme de création d'un fonctionnement automatique en mode d'économie d'énergie (famee) compatible avec l'agrégation de trames et la confirmation de blocs dans un scénario 802.11n Download PDF

Info

Publication number
WO2007085948A2
WO2007085948A2 PCT/IB2007/000183 IB2007000183W WO2007085948A2 WO 2007085948 A2 WO2007085948 A2 WO 2007085948A2 IB 2007000183 W IB2007000183 W IB 2007000183W WO 2007085948 A2 WO2007085948 A2 WO 2007085948A2
Authority
WO
WIPO (PCT)
Prior art keywords
frame
station
trigger
service period
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2007/000183
Other languages
English (en)
Other versions
WO2007085948A3 (fr
Inventor
Jarkko Kneckt
Jari Jokela
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Inc
Original Assignee
Nokia Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Inc filed Critical Nokia Inc
Publication of WO2007085948A2 publication Critical patent/WO2007085948A2/fr
Publication of WO2007085948A3 publication Critical patent/WO2007085948A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates, for example, to a mechanism to create Automatic Power Save Delivery (APSD) compatible with 802.11n frame aggregation and block acknowledgement (BA) mechanisms.
  • APSD Automatic Power Save Delivery
  • BA block acknowledgement
  • the present invention may provide, for example, bit handling for defining an unscheduled APSD (U-APSD) service period and ending it.
  • U-APSD unscheduled APSD
  • the present invention may also provide, for example, a method of aggregating a plurality of data frames into an aggregated data frame, starting a service period based on the transmitting of the aggregated frame, receiving an acknowledgement for the transmitted frame, and upon receiving the acknowledgement frame or aggregated data and the acknowledgement frame containing an indicator indicating end of service period, entering low power mode of operation.
  • the present invention may also include accomplishing the power save operation by using determinations made from the received frames.
  • One embodiment of the present invention is a method.
  • the method can include receiving a trigger frame from a terminal or other station (STA), using power save.
  • the method can also include triggering a service period based on receiving the trigger frame.
  • the method can further include sending a termination bit to the terminal, wherein the sending the termination bit to the terminal is configured to result in an end of the service period.
  • Another embodiment of the present invention is also a method.
  • This method can include sending a trigger frame to an STA in full power, for instance to an access point, wherein the trigger frame is configured to trigger a service period based upon reception thereof.
  • the method can further include receiving a termination bit from the STA in full power.
  • the method can additionally include ending the service period based on the termination bit.
  • a further embodiment of the present invention is a wideband local area network (WLAN) station (STA) operating in a power save state, for instance, a terminal.
  • the terminal includes a transmission unit configured to send a trigger frame to an access point or other node, operating in full power mode, wherein the trigger frame is configured to trigger a service period based upon reception thereof.
  • WLAN wideband local area network
  • the terminal also includes a reception unit configured to receive a termination bit from the access point.
  • the terminal further includes a processor unit configured to end the service period based on the termination bit.
  • An additional embodiment of the present invention is also a terminal.
  • This terminal can include transmission means for sending a trigger frame to an access point, wherein the trigger frame is configured to trigger a service period based upon reception thereof.
  • the terminal can also include reception means for receiving a termination bit from the access point.
  • the terminal can further include processor means for ending the service period based on the termination bit.
  • Another embodiment of the present invention is an access point.
  • the access point can include reception means for receiving a trigger frame from a terminal.
  • the access point can also include processor means for triggering a service period based on receiving the trigger frame.
  • the access point can further include transmission means for sending a termination bit to the terminal, wherein the sending the termination bit to the terminal is configured to result in an end of the service period.
  • a further embodiment of the present invention is also an access point.
  • the access point can include a reception unit configured to receive a trigger frame from a terminal.
  • the reception point can also include a processor unit configured to trigger a service period based on receiving the trigger frame.
  • reception point can further include a transmission unit configured to send a termination bit to the terminal, wherein the sending the termination bit to the terminal is configured to result in an end of the service period.
  • triggering the service period may use differing service period triggering and termination conditions depending on the block acknowledgment mechanisms used.
  • An additional embodiment of the present invention is a method.
  • the method includes transmitting an ACK frame from a first station.
  • the method also includes terminating a service period for delayed block acknowledgement using the ACK frame.
  • the method further includes, when a block acknowledgement frame is received and indicates that all transmitted frames were received correctly, maintaining a current state instead of triggering a new service period.
  • the method additionally includes, when the block acknowledgement frame is received and indicates that not all the transmitted frames were received correctly, triggering the new service period.
  • Figure 1 illustrates aggregate frames transmitted by an AP.
  • Figure 2 illustrates aggregate frames transmitted by a terminal.
  • Figure 3 illustrates terminology and explanations used in power save cases.
  • Figure 4 illustrates a simple case of 802.11 n aware power save with a single receiver aggregate.
  • Figure 5 illustrates an ongoing APSD service period between an AP and a terminal.
  • Figure 6 illustrates a single receiver aggregate in which an AP transmits all frames to the same terminal.
  • Figure 7 illustrates a single receiver aggregate transmitted by the terminal.
  • Figure 8 illustrates a similar frame exchange to Figure 7, except the AP uses a set EOSP bit in the BA frame.
  • Figure 9 illustrates a single receiver aggregate in which the terminal obtains a TXOP for aggregated frames.
  • Figure 10 illustrates an operation according to an embodiment of the present invention.
  • Figure 11 illustrates a single receiver aggregate in which not all frames are received correctly, and a conventional solution is used for U-APSD handling.
  • Figure 12 illustrates a delayed block ack according to mechanism in which all aggregates from AP had set EOSP, these are received correctly, and a delayed block ack starts a new service period.
  • Figure 13 illustrates a delayed block ack, according to an embodiment of the invention in which all frames received correctly, and therefore a delayed block ack does not start new service period.
  • Figure 14 illustrates a delayed block ack according to an embodiment of the invention, in which not all frames are received correctly.
  • Figure 15 illustrates a situation similar to Figure 14, except that the AP is able (in Figure 15) to aggregate the wrongly received frames with an ACK frame.
  • Figure 16 illustrates a delayed block ack, in which the terminal transmits aggregated data and access point (AP) responses with block ack.
  • Figure 17 illustrates a multireceiver aggregate with immediate block ack according to a conventional solution, in which the exact multi-receiver aggregation mechanism is not specified.
  • Figure 18 illustrates a multi-receiver aggregate with immediate block ack according to an embodiment of the invention, in which the exact multi-receiver aggregation mechanism is not specified.
  • Figure 19 illustrates a multireceiver aggregate with immediate block ack according to an embodiment of the invention, in which the exact multi-receiver aggregation mechanism is not specified.
  • Figure 20 illustrates a multireceiver aggregate with immediate block ack according to an embodiment of the invention, in which there is no buffered data for STA1 in power save (PS) and STA2 in PS, and the PSMP frame only defines an EOSP bit for terminal 2 and start and stop times from ack frame transmission interval.
  • the specified time in PSMP frame may be used only by the specified user.
  • Figure 21 illustrates a Block ACK Control Field.
  • Figure 22 illustrates BAR Control field, that is used in BAR and multiple
  • TID block acknowledgement frames
  • Figure 23 illustrates Multiple TID BAR frame and BAR frames.
  • Figure 24 illustrates operation states in power save.
  • Figure 25 illustrates various state changes in the terminal and access point.
  • Figure 26 illustrates a general method according an embodiment of the present invention.
  • Figure 27 illustrates a system according to an embodiment of the present invention.
  • Certain embodiments of the present invention may provide a mechanism to create Automatic Power
  • Certain embodiments of the present invention address a situation of aggregated frames transmitted from a terminal and the terminal receiving block acknowledgements to the transmitted aggregated frames.
  • Aggregated frames can serve as trigger frames to trigger service periods.
  • the frame would trigger an unscheduled APSD (U-APSD) service period.
  • U-APSD unscheduled APSD
  • Any correctly received frame from aggregated frames operates as a trigger frame to start the U-APSD service period for the terminal.
  • trigger flags Two flags can be used for delivery enabled Access Channel (AC) (deac) and non-delivery enabled AC (ndeac).
  • the ndeac flag can mean that once a terminal has sent an UL frame with such a flag the access point (AP) can transmit only ndeacs to the terminal which sent the trigger frame, in the service period that was triggered. With deac set, the AP can transmit data also from deac.
  • These flags can be in UL aggregation control, Block ACK Request (BAR) and Block ACK (BA) frames. Alternatively, only one trigger bit could be used to trigger traffic from all ACs.
  • a delayed block ACK When a delayed block ACK is received, it can be used to determine whether service period was started or not. If the block ACK indicates lost frames, then the service period is started. If the delayed block ack is not received, then the STA in full power considers that the service period is terminated and that triggering from STA in power save is required to establish a new U-APSD service period.
  • Service period termination can occur when an End Of Service Period (EOSP) bit is received in a block ACK frame, or block ack aggregated with QoS NULL and Acknowledge are received.
  • Block ACK thus can be terminating the service period only when it is acknowledged, or if it is a part of an aggregated frame, which is acknowledged.
  • EOSP End Of Service Period
  • the STA in full power can consider that the service prior with the STA in power save is terminated, if an acknowledgement frame is received for a frame or aggregated frames from the
  • the transmission of the delayed block ack from the STA in power save can trigger a service period only if it indicates that frames from the last transmitted aggregated frame have not been correctly received or if the block ack frame is aggregated with another frame that triggers the service period.
  • Data bits can be set independently in the DL PPDUs.
  • the EOSP and more data bits can be in every aggregated MPDU or just in the aggregation control frames, or the last or the first aggregated frame.
  • Certain embodiments of the present invention may accrue various advantages. For example, by defining how the service period is started and how it is ended for a terminal transmitting and receiving aggregated frames, the terminal may be able to save battery power.
  • the service period can be started based on aggregation information frame received by AP from the terminal, and ended by determining the end from received aggregation information frames and a flag therein indicating EOSP.
  • PPDU is considered to have set EOSP bit, so it is the last transmitted frame before terminal may go to sleep.
  • Figure 1 illustrates frame aggregates transmitted by the AP.
  • the figure shows different embodiments for valid EOSP and More Data (MD) bits information.
  • the frames that are identified with EOSP and MD labels in Figure 1 represent the EOSP and More Data bits value after the aggregated frame is transmitted.
  • the frames that do not have EOSP or MD labels in Figure 1 can have EOSP and More Data bits set to zero.
  • the EOSP and MD fields in these frames can be reserved, and can be configured not to contain valid information in the EOSP and MD filed.
  • Figure 1 shows a BAR frame at the end of each aggregate. A BAR frame may not be present in each aggregated frame. If the BAR frame is not present in the aggregated frame, valid EOSP and MD information can be present in the aggregated frames as shown in the illustrated cases.
  • PSMP Power Save Multi Poll
  • This frame is used to define multi receiver aggregate.
  • the PSMP frame can be used to carry valid EOSP and More Data bit values for all receivers for a multireceiver aggregate.
  • the aggregated frames may not contain any valid MD or EOSP bits or, alternatively, any of the aggregated frame formats, as shown in cases 1-6 transmitted by the AP to a single terminal during multireceiver Transmission Opportunity (TXOP) may be used.
  • TXOP multireceiver Transmission Opportunity
  • An example illustration of multireceiver aggregate is shown in Figure 17.
  • PSMP may also be used to describe frame exchange with only a single receiver.
  • Case 8 shows an embodiment in which PSMP frame is not used to carry valid EOSP or More Data bit values.
  • Case 9 shows an embodiment in which a
  • Block ACK frame is used to carry EOSP and More Data bit values.
  • Figure 2 illustrates frame aggregates transmitted by terminal.
  • the figure shows different embodiments for valid More Data (MD) bit(s) information.
  • the frames that are identified with MD labels in Figure 1 represent the More Data bit value after the aggregated frame is transmitted.
  • the frames that do not have MD labels in Figure 1 can have More Data bit set to zero.
  • Block ACK (BA) frame that is located as the first frame in aggregate contain valid More Data bit value.
  • the first BA does not have valid MD value, while the last BAR contains a valid More Data bit value.
  • Case 7 shows embodiment in which a Block ACK frame is used to carry a More
  • Figure 3 illustrates terminology and explanations used in power save cases. For example, as shown, a line with two end points defines the duration of a transmission opportunity. Continuing from top to bottom, the first long arrow with one head, but no fixed end point indicates the start of power save mode that can continue indefinitely, and, theoretically, infinitely.
  • the full power STA can buffer frames for the power save (PS) STA. During such a period there is no ongoing service.
  • the third arrow from the top, with one head and one endpoint also indicates a PS mode.
  • the sleep is over at the head of the arrow.
  • the full power STA may no longer consider the PS STA to be in sleep.
  • the fourth arrow with two heads is used to indicate channel access delay or used inter frame space.
  • the position of the arrow heads indicate the duration of the period.
  • the final arrow is the time axis.
  • the transmission shown above the time axis can be from a WLAN STA in active (full power) mode, while the transmissions below the time axis may be transmission from a WLAN STA in power save mode.
  • Figure 4 illustrates a single receiver aggregate.
  • the terminal has an ongoing APSD service period with the AP. All transmitted frames in the figure are received correctly.
  • the AP sets an EOSP bit to a PPDU, which is transmitted to terminal. Immediate block ack can be used for data exchange and after the transmitted Block ACK (BA) frame the terminal may return to power save state.
  • the Block ACK Request (BAR) may be used in the end of the aggregate frame, transmitted by AP, to request Block ACK (BA) frame.
  • Figure 5 illustrates a situation in which a terminal and an AP are engaging in an ongoing APSD service period. Both the initiator and the target node are transmitting data in the same TXOP.
  • the AP transmits a single receiver aggregate frame with a set EOSP bit.
  • the terminal responds with an aggregated immediate Block ack and data frame.
  • the transmitted frame from the terminal does not set the trigger bit and, thus, does not start a new service period.
  • the AP transmits a BA for the terminal's frame. After the frame exchange the AP considers the terminal to be in a power save state.
  • the terminal uses one of the mechanisms discussed below to avoid triggering a new service period with the AP. All transmitted frames are received correctly. If the terminal would have set the transmitted frame to trigger, it would have triggered a service period. In order to terminate a service period, the BA may contain a set EOSP bit and the BA should be acknowledged as shown in Figure 8.
  • Figure 6 illustrates a single receiver aggregate in which the AP transmits all frames to the same terminal. All transmitted frames contain a set EOSP bit. In transmissions, not all frames are received correctly, and retransmission occurs according to an embodiment of the present invention. The terminal stays in full power state until it receives the transmitted aggregated frame with a set EOSP bit correctly.
  • Figure 7 illustrates a single receiver aggregate transmitted by the terminal.
  • the aggregated frame if all frames are not received correctly, retransmission can occur according to an embodiment of the present invention, and an immediate block ack can be used.
  • the AP may terminate the service period with the aggregated frame, for instance, QoS-NULL frame and BA frame.
  • the QoS-NuII frame can be acknowledged by the terminal.
  • Figure 8 illustrates a similar frame exchange as shown in Figure 7, except that the AP uses a set EOSP bit in the BA frame. If the terminal receives a BA with the EOSP bit set, it can acknowledge the frame. After the AP has received the acknowledgement it considers the terminal to be in power save state. Therefore, the second frame transmitted from the AP has the EOSP bit set.
  • Figure 9 illustrates a single receiver aggregate in which the terminal obtains a TXOP for aggregated frames. The AP responds with an aggregated frame that contains a Block ACK, data frames, and a Block ack request for the terminal. The transmitted aggregate frame contains EOSP for the terminal. The terminal acknowledges the frames transmitted by the AP.
  • Figure 10 illustrates an operation according to an embodiment of the present invention.
  • the terminal and the AP are having APSD service period ongoing.
  • the AP transmits aggregate PPDU with set EOSP bit to terminal.
  • the terminal responds with the reverse direction aggregation frame, containing block ack and MAC frames.
  • the block ack frame the terminal responds that it has not received all aggregated frames correctly.
  • the AP responds to the reverse direction aggregation with set EOSP bit, a block ack frame, showing that not all frames have been received correctly and retransmits the failed frames from previous aggregate.
  • the terminal receives the finally transmitted frame correctly and transmits a successful block ack to AP. Because the terminal successfully acknowledged the aggregated frame that contained the set EOSP bit, the AP will consider terminal to be in power save. The status of the terminal's frames delivery does not affect the termination of the service period. The terminal obtains new TXOP for the frames needing retransmission and transmits them to the AP. The AP can consider that the transmitted frames start a new service period.
  • Figure 11 illustrates a single receiver aggregate in which not all frames are received correctly, and a conventional solution is used for U-APSD handling.
  • the transmitters are using delayed block ack, in which the responder is not able to respond with block ack, but just to send ACK and send block ack in the next TXOP.
  • the AP has set the EOSP bit in data transmissions and the AP considers the terminal in power save after it has received the frames and acknowledged them to the AP.
  • Figure 12 illustrates a delayed block ack according to a mechanism in which all aggregates from the AP had a set EOSP, these aggregates are received correctly, and a delayed block ack starts a new service period.
  • the handling of delayed block ack in Figure 12 can be viewed as conventional handling for delayed block ack. This mechanism can help to expand 802.11e power save mechanisms.
  • Figure 13 illustrates a delayed block ack according to an embodiment of the invention in which all frames are received correctly.
  • a delayed block ack does not start new service period, because all frames were received correctly.
  • the AP transmits aggregated frames that have set EOSP bit.
  • the terminal acknowledges these frames and the AP considers the terminal in power save state.
  • the terminal transmits Block ack, which defines that all frames are received correctly and the AP does not start a new service period for the terminal.
  • the last acknowledgement transmitted by AP is a normal acknowledgement frame as defined in 802.11 , which can provide a basis for future enhancements.
  • Figure 14 illustrates a delayed block ack according to an embodiment of the invention, in which not all frames are received correctly.
  • the aggregated frames transmitted from the AP may contain a set EOSP bit.
  • the terminal acknowledges these frames.
  • the AP considers the terminal to be in a power save state.
  • the terminal obtains a new TXOP for block ack transmission in which it indicates that it has not received all frames correctly. This frame triggers a new service period.
  • the AP retransmits the frames and the service period termination can operate as described in Figure 12.
  • Figure 15 illustrates a delayed block ack according to an embodiment of the invention, in which all frames are not received correctly.
  • the operation illustrated in Figure 14 is similar to the operation illustrated in Figure 13, except that in Figure 14 the AP is able to retransmit the incorrectly received frames in an aggregate frame with a block ack frame. The AP then considers the terminal in power save state after it has acknowledged the retransmitted data frames aggregate.
  • Figure 16 illustrates a delayed block ack, in which the terminal is triggering a service period with aggregated frames.
  • the AP can acknowledge the transmitted frames and obtain a new TXOP for block ack.
  • the transmitted block ack can contain a set EOSP bit, which can be acknowledged by the terminal. After the transmitted acknowledgement by the terminal, the AP can consider the terminal to be in power save.
  • FIG. 17 illustrates a multireceiver aggregate with immediate block ack according to a conventional solution, in which the exact multi-receiver aggregation mechanism is not specified.
  • an interframe space called Reduced InterFrame Space (RIFS) can be used between frames targeted to different recipients.
  • RIFS Reduced InterFrame Space
  • Such an interframe space is shorter than other interframe spaces use in wideband local area networks (WLANs), such as DIFS (distributed interframe space), SIFS (short interframe space) and other interframe spaces.
  • WLANs wideband local area networks
  • AP transmits two aggregated frames to terminals 1 & 2 both with a set EOSP bit. Both frames are received correctly and after the terminals have transmitted respective block ack frames, the AP considers the terminals in power save state as illustrated.
  • FIG. 18 illustrates a multi-receiver aggregate with immediate block ack according to an embodiment of the invention in which the exact multi-receiver aggregation mechanism is not specified.
  • the figure demonstrates how to use a Power Save Multi Poll (PSMP) frame for multi-receiver aggregation.
  • PSMP Power Save Multi Poll
  • the PSMP frame contains information of the download (DL) and upload (UL) transmission times for each receiver in TXOP. PSMP can help to conserve power by scheduling communications, as opposed to sending/receiving at random intervals.
  • the PSMP frame can be embodied as a MAC control frame that provides a time schedule to be used by the system's transmitters and receivers. Normally, the scheduled time begins immediately subsequently to the transmission of the frame.
  • the AP transmits frames with set EOSP bits. Terminal 1 does not receive all frames correctly, and the AP does not consider terminal 1 to be in power save state after it receives block ack from the terminal 1. Terminal 2 receives all frames correctly and the AP considers terminal 2 in power save after receiving ack from terminal 2.
  • FIG 19 illustrates a multireceiver aggregate with immediate block ack according to an embodiment of the invention in which the exact multi-receiver aggregation mechanism is not specified.
  • the power save multi poll (PSMP) frame or frames 1-4 contain a set EOSP bit for both terminals.
  • the terminals transmit aggregated block ack and data frames as a response to the AP's aggregate.
  • the AP transmits a new aggregate for the terminals in which the AP acknowledges the frames transmitted by terminal 1 and retransmits the failed frame with EOSP bit set in the response frame and acknowledges the frames transmitted by terminal 2.
  • the AP has allocated time for terminal 1 block ack and terminal 2 acknowledgement.
  • the allocated time for terminals transmission may be longer than as shown in the figure. In such case, the terminals may transmit data to the AP.
  • the AP After the PSMP frame is transmitted, the AP considers the terminals to be in power save state.
  • PSMP frame contains transmission start and end times for each terminal after the PSMP frame.
  • the PSMP frame can be used to transmit a large aggregate frame from AP to several terminals.
  • the PSMP frame also can specify transmission start and stop times for a specific terminal.
  • the responses from the terminals may contain both data and block acknowledgement frames, only a block acknowledgement frame or an ack frame.
  • Figure 20 illustrates a multireceiver aggregate with immediate block ack according to an embodiment of the invention, in which there is no buffered data for terminal 1 , and PSMP frame only defines EOSP bit for the terminal 2 and start and stop times from ack frame transmission.
  • the transmission to other terminals is illustrated as a frame transmission to only terminal 2, as an example, but the figures from multi aggregate operation could have several terminals in aggregates frame transmission.
  • the terminal 2 can operate as described in Figures 19 and 20.
  • Figure 21 illustrates a Block ACK Control Field.
  • the Block ACK Control field is used in block acknowledgement (BA) and Multiple Traffic Identification (TID) Block Acknowledgement frame formats.
  • Certain embodiments of the pressent invention can provide Block ACK, Control Field, More Data, and EOSP bits. These bits can be used as described in 802.11e amendment and if the BA is part of the aggregated frame these bits can contain valid information as described in Figures 1 and 2 above.
  • the Multiple TID Block ACK frame can be used when only a PSMP frame is used, as shown, for example, in Figures 17 -20.
  • the Block ACK frame may be used for cases shown in Figures 4 - 16.
  • Figure 22 illustrates a BAR Control field that is used in BAR and multiple TID block acknowledgement frames.
  • the invention can employ two embodiments for BAR Control Field. In the first " embodiment the BAR Control Field frame contains two trigger frames, and in the second embodiment the trigger frames are present in the BAR Control Field.
  • Figure 23 illustrates Multiple TID BAR frame and BAR frames. Both of these frames use a BAR Control Field as discussed above, in regard to Figure 20.
  • the trigger flags can be set by the terminal and the AP can consider these bits as reserved.
  • Two trigger flags can be used for delivery enabled AC (deac) and non-delivery enabled AC (ndeac).
  • the ndeac flag can indicated that once terminals have sent a UL frame with such a flag the access point (AP) can transmit only ndeacs to the terminal that sent the trigger frame in the service period that was triggered. With deac set, the AP can transmit data also from deac.
  • Certain embodiments of the present invention provide Block ACK Control Field More Data and EOSP bits. These bits can be used as described in 802.11e amendment and, if BA is part of the aggregated frame, these bits can contain valid information as described in regard to Figures 1 and 2 above.
  • the trigger flags may be used in other frames, like Quality of Service (QoS) Null frames to trigger service period. Also just a plain Block ACK Request frame may be transmitted to trigger a U-APSD service period.
  • Figure 24 illustrates various operational states in power save. As illustrated in Figure 24, a non-AP station (STA) can initially be in a sleep state. It can than exhibit a state change to active state. One form of active state is a power save state.
  • the STA While in power save state, the STA can change state to sleep state, can refresh its power save state, or can change state to full operation. Similarly in full operation, the STA can refresh its full operation state or revert to power save state. It is considered that, in sleep state, the receiver of the STA is off. In active power save state, the access point (AP) considers the STA in power save state, but the STA may transmit data.
  • AP access point
  • Figure 25 illustrates various state changes in the terminal or STA and the AP.
  • a non-trigger frame to the AP and an ACK from the AP can trigger the AP to consider the terminal in power save state, while the terminal considers itself refreshed in its power save state.
  • a trigger frame to the AP and an ACK or data plus ACK from the AP can trigger the AP to consider the terminal active, and can cause the terminal to consider itself in full operation. While the terminal and AP share this understanding, they may exchange data (as illustrated, for example, in Figures 4-20) while refreshing their states.
  • the terminal may consider itself in power save state, and send an ACK acknowledging all frames.
  • the AP may receive the ACK and consider the terminal in a power save state.
  • Figure 26 illustrates a general method according an embodiment of the present invention.
  • the method may begin with a terminal, such as a user equipment, mobile phone, personal digital assistant or other portable, communication-enabled electronic device, sending 2410 a trigger frame.
  • the trigger frame may be received 2420 by an access point.
  • the access point may, in response to the trigger frame, if certain conditions are met, trigger
  • the access point may send
  • the terminal may receive 2412 the termination bit. If certain prerequisites are met, as described in more detail above, the terminal may terminate 2414 the service period.
  • FIG. 27 illustrates a system according to an embodiment of the present invention.
  • the system may include a terminal 2510, and an access point 2520, connected by a communication link 2530, which may be a radio link. If a radio link is used, the terminal 2510 and access point 2520 may include suitable communications hardware and software for communicating over the radio link including, but not limited to, respective antennas 2505.
  • the terminal 2510 may include a transmission unit 2512, which may be arranged to operate together with a processor 2514 to send frames of data to the access point 2520.
  • the terminal 2510 may include a reception unit 2516 configured to operate together with a processor 2514 to receive frames of data from the access point.
  • the access point 2520 may include a transmission unit 2522, which may be arranged to operate together with a processor 2524 to send frames of data to the terminal 2510. Furthermore, the access point 2520 may include a reception unit 2526 configured to operate together with a processor 2524 to receive frames of data from the access point.
  • the terminal 2510 and the access point 2520 may be implemented in respective hardware, software, or combination thereof.
  • processor 2514 or processor 2524 may, for example, be a general purpose computer or an application specific integrated circuit.
  • the terminal 2510 and the access point 2520 may be provided with respective memories (not shown), which may be local to the respective terminal 2510 and access point 2520, or which may be remote from one or both of them.
  • each of the terminal 2510 and the access point 2520 may be implemented as a computer program embodied on a computer readable medium encoding instructions to perform various operations of the methods described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

La présente invention concerne un mécanisme qui permet de créer un fonctionnement automatique en mode d'économie d'énergie (FAMEE) compatible avec l'agrégation de trames et la confirmation de blocs (ack) dans un scénario 802.11n. Divers procédés d'utilisation des confirmations de blocs sont présentés. De plus, le traitement des bits en vue de définir une période de service FAMEE non programmée (FAMEE-NP) et la fin de cette dernière, est expliqué. On décrit un procédé dans lequel sont effectués l'agrégation d'une pluralité de trames de données sous forme d'une trame agrégée, le lancement d'une période de service sur la base de la transmission de la trame agrégée, la réception d'une confirmation pour la trame transmise et, à la réception de la trame de confirmation contenant un indicateur stipulant la fin de la période de service, l'activation du mode de fonctionnement à faible consommation de puissance.
PCT/IB2007/000183 2006-01-27 2007-01-26 Mécanisme de création d'un fonctionnement automatique en mode d'économie d'énergie (famee) compatible avec l'agrégation de trames et la confirmation de blocs dans un scénario 802.11n Ceased WO2007085948A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US76251206P 2006-01-27 2006-01-27
US60/762,512 2006-01-27
US77252306P 2006-02-13 2006-02-13
US60/772,523 2006-02-13

Publications (2)

Publication Number Publication Date
WO2007085948A2 true WO2007085948A2 (fr) 2007-08-02
WO2007085948A3 WO2007085948A3 (fr) 2007-11-29

Family

ID=38309576

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/000183 Ceased WO2007085948A2 (fr) 2006-01-27 2007-01-26 Mécanisme de création d'un fonctionnement automatique en mode d'économie d'énergie (famee) compatible avec l'agrégation de trames et la confirmation de blocs dans un scénario 802.11n

Country Status (2)

Country Link
US (1) US20070191052A1 (fr)
WO (1) WO2007085948A2 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2451114A1 (fr) * 2010-11-04 2012-05-09 Canon Kabushiki Kaisha Appareil de communication, procédé de contrôle correspondant et support de stockage
CN102860093A (zh) * 2010-03-09 2013-01-02 三星电子株式会社 发送设备和接收设备的通信方法
CN102893676A (zh) * 2010-03-09 2013-01-23 三星电子株式会社 用于节能的终端和接入点的通信方法
CN103069892A (zh) * 2010-08-17 2013-04-24 三星电子株式会社 关于多用户传输机会(txop)节电的终端和接入点的通信方法
US9277346B2 (en) 2013-06-25 2016-03-01 Nokia Technologies Oy Termination of service period in wireless network
KR20170099894A (ko) * 2014-12-22 2017-09-01 퀄컴 인코포레이티드 향상된 절전 프로토콜을 위한 방법들 및 장치들
CN107547175A (zh) * 2016-06-24 2018-01-05 珠海市魅族科技有限公司 无线局域网的通信方法、通信装置、接入点和站点
US11337152B2 (en) 2010-03-09 2022-05-17 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for power saving

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7631240B2 (en) * 2005-03-07 2009-12-08 Qualcomm Incorporated Block ack protocols for wireless packet network
US7822405B2 (en) * 2006-03-30 2010-10-26 Intel Corporation Power saving in VoIP transmission apparatus, systems, and methods
JP2009111769A (ja) * 2007-10-30 2009-05-21 Canon Inc 無線通信装置及びその制御方法並びにプリンタ装置
JP2009165008A (ja) * 2008-01-09 2009-07-23 Oki Semiconductor Co Ltd 無線端末装置及び無線基地局装置
US8886755B1 (en) * 2009-12-09 2014-11-11 Marvell International Ltd. Method and apparatus for facilitating simultaneous transmission from multiple stations
KR101286961B1 (ko) 2009-12-17 2013-07-23 한국전자통신연구원 무선통신 시스템의 단말에서의 전원 절약 방법 및 시스템
WO2011097141A2 (fr) * 2010-02-02 2011-08-11 Marvell World Trade Ltd. Fonctions d'économie d'énergie dans un dispositif de télécommunication
US20120184313A1 (en) * 2011-01-19 2012-07-19 Henry Ptasinski Method and System for Medium Access with Reduced Power Consumption for Constrained Wireless Devices
US9001720B2 (en) 2011-08-31 2015-04-07 Maarten Menzo Wentink Power save with data fetch time, with end of data indication, and with more data acknowledgement
US8730960B2 (en) 2011-10-25 2014-05-20 Cisco Technology, Inc. Providing multicast transmissions with partial state block acknowledgments and retries
US9504032B2 (en) * 2012-09-13 2016-11-22 Interdigital Patent Holdings, Inc. Method, wireless transmit/receive unit (WTRU) and base station for transferring small packets
US9781670B2 (en) * 2013-08-19 2017-10-03 Lg Electronics Inc. Method and device for implementing power saving in wireless LAN system
US9930660B2 (en) * 2015-05-28 2018-03-27 Intel IP Corporation Scheduling trigger frames in a high efficiency wireless local-area network
US10362604B2 (en) * 2016-07-18 2019-07-23 Intel IP Corporation Multi-user multiple-input multiple-output reverse direction duration communications
US9794879B1 (en) * 2016-12-23 2017-10-17 Intel IP Corporation Power saving mechanism for MU-MIMO transmissions
US10159060B2 (en) 2016-12-28 2018-12-18 Intel Corporation Coordinated basic set (BSS) communication with different modulation coding scheme (MCS) per link
WO2018236398A1 (fr) * 2017-06-23 2018-12-27 Intel Corporation Procédés et appareil pour permettre des communications sur des canaux secondaires non adjacents dans des protocoles de réseau local sans fil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6917598B1 (en) * 2003-12-19 2005-07-12 Motorola, Inc. Unscheduled power save delivery method in a wireless local area network for real time communication
EP1589702B1 (fr) * 2004-04-21 2012-05-09 Avaya Inc. Organisation de la délivrance de trames tamponnées fonctionnant en mode d'économie d'énergie dans un point d'accès

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2849502A1 (fr) * 2010-03-09 2015-03-18 Samsung Electronics Co., Ltd Procédé de communication d'un terminal et d'un point d'accès pour des économies d'énergie
CN105722196B (zh) * 2010-03-09 2019-11-15 三星电子株式会社 用于节能的终端和接入点的通信方法
CN102860093A (zh) * 2010-03-09 2013-01-02 三星电子株式会社 发送设备和接收设备的通信方法
CN102893676A (zh) * 2010-03-09 2013-01-23 三星电子株式会社 用于节能的终端和接入点的通信方法
CN102860093B (zh) * 2010-03-09 2016-08-03 三星电子株式会社 发送设备和接收设备的通信方法
EP2545733A4 (fr) * 2010-03-09 2014-05-07 Samsung Electronics Co Ltd Procédé de communication d'un terminal et d'un point d'accès pour économiser de l'énergie
EP2545734A4 (fr) * 2010-03-09 2014-05-07 Samsung Electronics Co Ltd Procédé de communication d'un appareil de transmission et d'un appareil de réception
US10334526B2 (en) 2010-03-09 2019-06-25 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for power saving
CN105722196A (zh) * 2010-03-09 2016-06-29 三星电子株式会社 用于节能的终端和接入点的通信方法
US8964613B2 (en) 2010-03-09 2015-02-24 Samsung Electronics Co., Ltd. Communication method of a transmission apparatus and a reception apparatus
US11337152B2 (en) 2010-03-09 2022-05-17 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for power saving
US9344965B2 (en) 2010-03-09 2016-05-17 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for power saving
CN102893676B (zh) * 2010-03-09 2016-03-09 三星电子株式会社 用于节能的终端和接入点的通信方法
US9635611B2 (en) 2010-03-09 2017-04-25 Samsung Electronics Co., Ltd. Communication method of a transmission apparatus and a reception apparatus
EP2938136A1 (fr) * 2010-03-09 2015-10-28 Samsung Electronics Co., Ltd. Procédé de communication d'un appareil de transmission et appareil de réception
US9232474B2 (en) 2010-08-17 2016-01-05 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for multi-user transmission opportunity (TXOP) power saving
US9155043B2 (en) 2010-08-17 2015-10-06 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for multi-user transmission opportunity (TXOP) power saving
EP2606685A4 (fr) * 2010-08-17 2014-05-07 Samsung Electronics Co Ltd Procédé de communication d'un terminal et d'un point d'accès pour une économie d'énergie d'opportunité de transmission (txop) multi-utilisateurs
CN103069892B (zh) * 2010-08-17 2016-12-28 三星电子株式会社 关于多用户传输机会(txop)节电的终端和接入点的通信方法
EP2852229A3 (fr) * 2010-08-17 2015-07-01 Samsung Electronics Co., Ltd Procédé de communication d'un terminal et point d'accès pour l'économie d'énergie de possibilité de transmission multi-utilisateurs (TXOP)
CN103069892A (zh) * 2010-08-17 2013-04-24 三星电子株式会社 关于多用户传输机会(txop)节电的终端和接入点的通信方法
US9456414B2 (en) 2010-08-17 2016-09-27 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for multi-user transmission opportunity (TXOP) power saving
US9516593B2 (en) 2010-08-17 2016-12-06 Samsung Electronics Co., Ltd. Communication method of a terminal and an access point for multi-user transmission opportunity (TXOP) power saving
US8964631B2 (en) 2010-11-04 2015-02-24 Canon Kabushiki Kaisha Communication apparatus, control method for communication apparatus, and storage medium
CN102457950B (zh) * 2010-11-04 2015-09-30 佳能株式会社 通信装置及通信装置的控制方法
EP2451114A1 (fr) * 2010-11-04 2012-05-09 Canon Kabushiki Kaisha Appareil de communication, procédé de contrôle correspondant et support de stockage
CN102457950A (zh) * 2010-11-04 2012-05-16 佳能株式会社 通信装置及通信装置的控制方法
US9277346B2 (en) 2013-06-25 2016-03-01 Nokia Technologies Oy Termination of service period in wireless network
KR20170099894A (ko) * 2014-12-22 2017-09-01 퀄컴 인코포레이티드 향상된 절전 프로토콜을 위한 방법들 및 장치들
KR102352018B1 (ko) 2014-12-22 2022-01-14 퀄컴 인코포레이티드 향상된 절전 프로토콜을 위한 방법들 및 장치들
CN107547175A (zh) * 2016-06-24 2018-01-05 珠海市魅族科技有限公司 无线局域网的通信方法、通信装置、接入点和站点
CN107547175B (zh) * 2016-06-24 2020-06-19 珠海市魅族科技有限公司 无线局域网的通信方法、通信装置、接入点和站点

Also Published As

Publication number Publication date
WO2007085948A3 (fr) 2007-11-29
US20070191052A1 (en) 2007-08-16

Similar Documents

Publication Publication Date Title
US20070191052A1 (en) Automatic power save delivery (APSD) compatible with 802.11n frame aggregation and block acknowledgement
US11849393B2 (en) Method and apparatus for transmission management in a wireless communication system
US11424862B2 (en) Data retransmission method and device, data response method and device, and storage medium
US8023453B2 (en) Methods and systems for providing reliable multicast service in a WLAN system
JP4331088B2 (ja) 通信装置および通信方法
US7688770B2 (en) Method for allocating transmission period in a wireless communication system
US8472365B2 (en) Method and system for acknowledgement and retransmission of multicast data in wireless local area networks
US7372855B2 (en) System and method for synchronizing an IEEE 802.11 power-save interval
JP2009515401A (ja) マルチキャスト及び／又は同報肯定応答機構
WO2013064113A1 (fr) Procédé et appareil de création d'un accusé de réception de données destinés à une extrémité de réception et une extrémité d'émission
US8755403B2 (en) Block acknowledgement for wireless communication methods, apparatuses and systems
US20070195813A1 (en) Multicast packet transmitting method of wireless network
US7613191B2 (en) Packet transmission method of wireless network

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07705473

Country of ref document: EP

Kind code of ref document: A2